ThreadLocal介紹和用法

ThreadLocal和synchronized用法比較
package com.sodao.lucene;

import java.util.Random;

public class MultiThreadTest  implements Runnable{
    
    Studen studen = new Studen();
    
    @Override
    public void run() {
        String currentThreadName = Thread.currentThread().getName();
        System.out.println(currentThreadName + " is running ....");
        //同步
        synchronized (studen) {
            Random random = new Random();
            int age = random.nextInt(100);
            studen.setAge(age);
            System.out.println(currentThreadName + " is set age: " + age);
            System.out.println(currentThreadName + "is first get age: " + studen.getAge() );
            try {
                Thread.sleep(500);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
            System.out.println(currentThreadName + " is second get age: " + studen.getAge() );
        }
    }
    
    public static void main(String[] args) {
        MultiThreadTest m = new MultiThreadTest();
        Thread t1 = new Thread(m,"Thread A");
        Thread t2 = new Thread(m,"Thread B");
        t1.start();
        t2.start();
    }
}

class Student {
    int age;

    public int getAge() {
        return age;
    }

    public void setAge(int age) {
        this.age = age;
    }
    
}